SmogRank / World / United Kingdom / Wales / October 2025
Most polluted cities in Wales, United Kingdom, October 2025
2 cities in Wales, United Kingdom ranked by their average PM2.5 over the 31 days. Worst: Newport at 6.9 µg/m³, #1,162 of 2,564 cities in the world. Cleanest: Cwmafan at 4.4. A city needs measurements on 70% of the days to be ranked.
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
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SmogRank, most polluted cities in Wales, United Kingdom, PM2.5, October 2025, smogrank.com/gb/region/wales/history/2025-10 (accessed 8 Oct 2026). Some readings from Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); Love My Air (City and County of Denver), no reuse terms published.
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.